Machine foe geinding and deessing file blanks



4 Sheets-Sheet 1.

(No Model) N A. WEED.

MAGHINE FOR GRINDING AND DRESSINGFILE BLANKS.

PatentedOct. 30, 1883.

'IIIILW mu mi 2 t e e S S u V 8 .h s 4 D E w a d O M 0 m MAGHINE FOR GRINDING-AND DRESSING FILE BLANKS. 110.287.7 16..

Patented. Oct. 30, 1883.

WITNESSES:

. I'NYENTOR u PETERS PMS-magnifier, Wang-m n, r;

(No Model.) V 4 Sheets-Sheet 3.

A. WEED.

MACHINE FOR GRINDING AND DRESSING FILE BLANKS. No. 287,746. r Patentedoct. 30, 1883.

WITNEES: I INVENTOR (No Model.) 1 Shets-Sheet 4.

A. WEED. MACHINE FOR GRINDING AND DRESSING FILE BLANK S.

Patented Oct. 30, 1883.

FIQH".

lllme n N. PETERS. PtmaLiihn n Mr. Wadinpon. D. c.

, movements of p the machine.

' UNITED STATES PATENT OFFICE. I

ALFRED WEED, on PHILADELPHIA, PENNSYLVANIA.v I

MACHINE FOR GRINDING AND DRESSING FlLE-BLANKS.

SPECIFICATION forming part of Letters Patent No. 287,746, dated October 30, 1883., j

Application filed January 20, 1883. No model.)

To all whom it may concern:

Be it known that I, ALFRED WEED, of the city and county of Philadelphia, in the State of Pennsylvania, have invented certain new and useful Improvements in .Machines for Grinding and Dressing File-Blanks; and I do hereby declare the following is a specification of my improvements, reference being had to the accompanying drawings, wherein Figure l'is a front view of the machine in perspective, showing the general distribution of parts. Figs. 2 and 3 are respectively front and rear'elevations thereof. Fig. 4 isa longitudinal vertical section on the line w w of Fig. 2; and Fig. 5 is a vertical longitudinal section, On an enlarged scale, through the center of the grindstone-shaft, showing certain details of the adjusting mechanism.

My invention consists in a machine whereby a number of file-blanks may be ground or dressed at once, the movements being, as far as possible, automatic, and the working parts being so constructed and combined as to permit the placing of the blanks in position, their examination during the grinding, and their removal when finished, without interrupting the Furthermore, since to insure uniformity and accuracy in the blanks itis essential that the movements of the working parts should be true, my invention further consists in means'whereby all these parts can be readily and minutely adjusted. I also provide a device for dressing and truing the face of the grindstone.

5 To facilitate comprehension of the more detailed description hereinafter given, the main features of the machine may be pointed out lIJ y reference to the perspective View shown in *ig. 1. 1

A frame, F, in which the blanks (indicated by dotted lines) are held is vertically reciprocated in a direction tangential to the periphery of the revolving grindstone G. Thisreciprocation is effected by screw-and-bevel gearing above the frame, actuated alternately in opposite directions by belts automatically shifted upon the pulley G. The grindstone is also reciprocated continuously in the direction of its axis of rotation and across the face of the frame F. The bearings of the grindstoneshaft are adjustable toward and from the frame F, and the latter is held against the grinding- A bridge, B braces the upper ends of the frame A, and supports the mechanism by which the file-blank frame is reciprocated. DD are pillow-blocks forming bearings for the grindstone-shaft D, which is driven by the pulleys G O. The grindstone G is secured in position between the disks 0 one of which is rigidly attachedto the shaft D, and theother is adapted to move thereon, being clamped against the stone by means of nut N working upon a threaded portion of the "shaft. One end of the shaft D has a cam-slot,

D formed on it, and a pin, D in theeye-piece D, securedto the pillow-block D, fits in the cam-slot D and causes the shaft D, carrying the grindstone, to reciprocate laterally during its revolution. The pillow-blocks D D slide upon the girders B B, their movements being controlled by the screw-rods O,which, together with their adjacent mechanism, are shown on an enlarged scale in Fig. 5. The screws 0 engage with sleeve-nuts O, revolving in suit able bearings in the frame A, andsecured againstlongitudinal movement by collars O and M. The collars M are provided with miter-gears, as shown, which engage with corresponding miter-gears, M upon the shaft m, mounted in projecting bearing-piecesL, and

actuated by'means of the hand-wheel M, and as the screw 0 and its nut O, on one side of the machine, are threaded in the reverse direction from that of the similar screw and nut on the opposite side, it is obvious that the r0 tation of the hand-wheel M in either direction will shift both the pillow-blocks D D together toward or from the frame A. A cross-head, F is adapted to movev vertically in guides F* within the frame A; The crosshead is cast with a central enlargement or socket to receive the end of the actuatingscrew held securely in position by means of the pin F which passes through both the cross-head and screw. Beneath this socket,

- on' the side adjacent to the grindstone with and at right angles to the cross-head F, is the transverse extension I), longitudinally slotted, as shown at a in Fig. 4, to receive the carriage F, the cross-section of the slot and of the carriage F being indicated by the dotted lines in Fig. 8. A screw, F extends from end to end of the slot, passing through a correspondingly-threaded opening in the carriage F. It will thusbe seen that while the carriage F may be adjusted at any point in the length of the slot by turning the screw F its weight does not rest upon said screw, but is sustained by the inclined sides of the slot at. The carriage F is provided with two pendent lugs upon its under face, bored out for the reception of a bolt, F which passes through the eye of the suspension-rod F The open rectangular frame F is secured to the lower end of the rod F by means of the screw-thread and the jam-nut F. Vithin the rim or flange formed by the sides of the frame F is snugly fitted the plate F, secured in position by means of the bolt and latch f f*, which hold it against the diagonal projections across the corners of the frame. The plate F is provided parallel eross-pieces f, forming rests for the file-blanks f, the tangs of the latter being inserted behind a crosspiece, f, at the bottom of the plate F. Rollers P P, journaled upon carriages QQ, are arranged to bear against the back of the frame F, (or that side which is farthest from the grindstone,) but clear of the plate F, so as not to interfere with its removal at any time from the frame F. The carriages Q Q slide in horizontal dovetailed guides K K on the main frame A, each carriage being formed with an inside thread engaging with a screw, P, and the screws P P, whose threads run in opposite directions, being'actuated by means of the miter-gears M, M", and M, M, respectively. The mitergears M and M are mounted upon the shaft m, already referred to, and by the rotation of j the hand-wheel M can be adjusted toward or from the frame F, thus causing the blanks supported on the plate F to hear more or less closely against the-face of the grindstone C. Each of the miter-gears M, M M, M, M, M, M, and M is secured co its shaft by a setscrew, as indicated, by loosening which the gear is released and the shaft remains stationary, while the others are revolved. This enables the operator to readily correct any want of parallelism in the adjustable carriages Q Q or pillow-blocks D D by loosening the gear, which may be too far back, and rotating the other until the proper point is reached for causing it to again engage with its shaft. So, also, the pillow -bloeks may both be moved simultaneously without affecting the position of the rollers, and vice versa.

The devices for causing the vertical reciprocation of the frame F are as follows: A screw, F is secured to the movable cross-head F", and engages with a nut bevel-gear, F, revolving horizontally in bearings upon the bridge B meshing with the gear F, is secured to the horizontal driving-shaft H, mounted in bearings I I, and provided with two loose pulleys, G G and an intermediate fast pulley, G. Standards J J upon the bridge B support the sliding bars E and E, the former of which carries the belt-shifters E" E, and the latter the similar belt-shifters, E E. The bars E and E are movable independently of one another, but that end of the bar E which carries the belt-shifters E abuts against the projecting side of the belt-shifter E, so that when the bars are in the position shown in Fig. 3 the movement of the bar E to the left, or toward the central pulley, G, will push thebelt-shifters E and bar E toward the loose pulley G. Conversely, when the belt-shifters E are upon the loose pulley G and the belt-shifters E are upon the central pulley, G, the movement of the bar E and its belt-shifters E to the right, or toward the central pulley, G, will push the bar E and belt-shifters E toward the loose pulley G It will be observed, however, that this combined or joint movement of the bars only takes place when the belt-shifters are upon immediately adjacent pulleys, and then is only effected through the movement of thebar whose belt-shifters are for the time being upon a loose pulley. Thus, supposing the bars to be in the positions shown in Fig. 3, if the bar E (whose belt-shifters E are then upon the fast pulley G) should be moved to the left, or foward the loose pulley G, the bar IE will remain stationary, the belt-shifters will be in the positions shown in Fig. 2, and then neither bar will by its movement affect the other. Connecting-rods E are respectively secured to the bars E and E by clamps E and E. The connecting-rod E is actuated through the bellcrank E, and'the rod E through a similar bellcrank, E. The shafts or pivots of these bellcranks extend across the under side of the bridge 13, as shown in Fig. 4, so that the upright arms of the bell-cranks are upon the same side thereof as are the sliding bars, while the horizontal arms are on the opposite side. Pieces F F are mounted, one upon a horizontal arm projecting from the top of the screw F, and the other upon the sliding cross -h ead F, carrying the bar F, upon which the tap-pins F and F are supported in vertically adjustable clamps. The pieces F F are tapped with a number of screw-holes, so as to permit the lateral shifting of the bar F".

The construction of the grinds'tone-dressing devices is as follows: A horizontal shaft, A", having at one end a cross-handle, A, is freely suspended in bearings A A which slide vertically in ways A A, cast upon the side of the frame A, adjacent to the grindstone C. The sliding bearing pieces A A are centrally threaded to engage with the vertical screws A A, provided with miter-gears A, which are actuated by means of the pinion-shaft A and hand wheel A. As the screws'A A are threaded in opposite directions, the rotation A corresponding bevel pinion, F,

IIO

of the hand-wheel A moves the bearing-pieces A simultaneously in the same direction. The operator is thus enabled to impart a slow upward or downward motion to the shaft A moving it toward or from the grindstone. The gears A being secured to their respective shafts by set-screws, (similar to those already described in reference to the gears M, M &c. parallelism of the shaft A with the grindstoneface can be insured. Secured between collars clamped upon the shaft A are several toothed dressing-disks, -0

The mode of operation of the machine is as follows: Should the grindstone require to have its surface trued, power is applied to its driving-pulley O, andwhen the stone is in rapid rotation the hand-wheel A -is turned so as to adj ustthe dresser-shaft A toward it. When the toothed disks (3 have been brought into contact with the face of the stone, they are drawn back and forth across it by means of the handle A* until the stone is cut or dressed true, when the shaft'A is raisedclear of the stone by reverse rotation of the hand-wheel A. Anumber ofthe roughly-formed file-blanks are then secured in the plate F, and the latter is placed within the frame F, and locked therein by means of the latch device f f Figs. 2,3, and 4 show the plates and blanks in place, the frame F hanging in a vertical position on the pivot-bolt F and the screw F being at the extreme upward point of its movement. The

grindstone having been set by means of its sliding bearings D D in the proper .position 'for acting upon the blanks during the vertical reciprocation of the frame F, and the rollers P P having been adjusted so as to bear against the back of the frame, power is applied to the belts upon the pulleys O, G, and G As is indicated by the arrows, .Fig. 2, the belts upon the loose pulleys G and G" are running in opposite directions, and, it beingdesired to cause the descent of the screw F, the beltshifters E 1 1 are moved by hand, so as to shift the belt fromthe loose pulley G onto the fast pulley G, the other belt-shifters E E remaining. stationary. Therotation of the pulley G and shaft H in the direction of the arrow upon G causes the nut bevel-gear F to turn to the left, (or in a direction opposite to the hands of a watch,) and thus 'forces the screw F and cross-head F downward. When the screw F approaches the extremity of its downward movement, the tap-pin F strikes the horizontal arm of the bell-crank E, depressing it, and, through the connecting-rod E and bar E, moving the belt-shifters E E onto the central or fast pulley G. As has been before explained, this movement pushes the belt-shifters E 13 onto the loose pulley G thus reversing the motion of the fast pulley G, causing the ascent of the screw F and cross-head WVhen the screw F approaches the end of its upward movement, as indicated in Fig. 3, the tap-pin F strikes the V horizontal arm of the belt-crank E, raising it and throwing the be1t-shifters E E onto the fast pulley G. This movement pushes the belt-shifters E E onto the loose pulley G, and the motion of the fast p'ulley is again reversed,

so as to cause the descent of the screw. By.

forces the file-blanks f into close contact with the rapidly-revolving stone. As has before been explained, the stone itself has a lateral reciprocating motion caused by the pin D and cam-slot D and the grinding is effected by these combined movements of vertical and horizontal reciprocation. only prevents the formation of lines and ridges in the file-blanks from inequalities in the grinding-surface, but obviates the uneven wearing away'of the stone itself. The arrangement of the blanks upon the removable plate F permit-s the operator to examine them at any moment by tilting the plate backward, or even to remove the plate and insert another containing'new blanks without stopping the machine.

The advantages of the various adjusting devices need'not be particularized, as they will be obvious to one skilled in the use of such machinery,,and their several modes of operation have been fully explained above.

I claim v 1. The combination, with the grinding de- This method not vice, of a blank-holder and a reciprocating 7 frame adapted to receive and secure said holder, but open at the back (or side which is farthest from the grinding device) to permit the insertion and removal of the blank-holder through the frame, substantially as set forth. 2. The combination, with the reciprocating frame and its'removable blank-holder, of the rollers P, adapted to bear against said frame adjacent to, but clear of the blank-holder, substantially as set forth.

V 3. The combination of the sliding pillowblocks of the grindstone-shaft with the screwconnections 0 O and the hand-wheel shaft m,

said screw-connections and hand-wheel shaft being provided with bevel-gears separately adjustable thereon, whereby said pillow-blocks can be jointly as well as separately adjusted by means of said hand-wheel shaft.

4. The combination of the sliding carriages 1 Q of the bearing-rolls with the screw-rods P and hand-wheel shaft m, said screw-connections and shaft being provided with bevelgears separately adjustable thereon, whereby said carriages can be jointly as well as sepa rately adjusted by said shaft. v

- ALFRED WEED. Witnesses: CHARLES F. ZIEGLER,

- S. H. PooLE. 

